Update pep number

Author: pablogsal

peps/pep-0778.rst peps/pep-0768.rstpeps/pep-0778.rst renamed to peps/pep-0768.rst

@@ -1,7 +1,6 @@
 PEP: 768
 Title: Safe external debugger interface for CPython
 Author: Pablo Galindo Salgado <pablogsal@python.org>, Matt Wozniski <godlygeek@gmail.com>, Ivona Stojanovic <stojanovic.i@hotmail.com>
-Discussions-To: xxxxx
 Status: Draft
 Type: Standards Track
 Created: 25-Nov-2024